Cinemato-phonographic photography



Patented May 1, 1934 PATENT; OFFICE CINEMATO -PHONOGRAPHIC PHOTOGRAPHY Pierre Butez, Vaucresson,

Courbevoie, France, assignors and Pierre Contant,

to Societe Independante de Telegraphic Sans Fil, Malakofi,

France No Drawing. Application March 27, 1930, Serial No. 439,527. In France March 27, 1929 3 Claims.

The present invention relates to cinemato-phonographic photography.

Cinemato-phonographic methods are known in which the entire film surface is covered with a 5 photographic image adapted to be projected and an acoustic image or record, the former being composed of a substance opaque to visible and v transparent to invisible radiations and the latter of a substance opaque to invisible and transparent to visible radiations.

The object of the invention is to provide a method for treating metallic photographic (acoustic) images so as to substitute a cupric salt, such as cupric chloride or sulphate, such salt be- 18 ing transparent to visible and opaque to infra-red radiations for the usual silver image.

The method may be carried out as follows:

The silver of the acoustic image or record is first transformed into silver ferrocyanide by 20 means of an ammoniacal solution of potassium ferricyanide. After washing to eliminate the excess ferricyanide and the potassium formed, the film is submerged in a bath of cupric chloride. The silver ferrocyanide is gradually transformed into the corresponding cupric salt with formation of silver chloride which may be removed by means of a solution oi ammonium sulphocyanide. The cupric ferrocyanide formed on the film is then treated with caustic alkali solution to form cupric hydroxide which is finally converted into the corresponding chloride or sulghate by means of hydrochloric or sulphuric aci l The final film may include silver, copper, platinum, asphalt, or any other substance opaque to visible and transparent )0 invisible radiations.

, It is to be understood that the foregoing methods are applied to film in which the ordinary silver photographic image lies next to the film 4 supporting surface, the silver acoustic image being superposed on the ordinary photographic image.

What-we claim is:-

1. The method of treatinga film having a photographic record of known type and an'acoustic silver record mutually superposed which in a combined group of steps consists in treating the silver acoustic record with an ammoniacal solution of potassium ferricyanide, washing, then treating the film first with a cupric chloride solution and subsequently with'an ammonium sulphocyanide solution, and finally immersing the film in an alkaline solution in order to produce a cupric hydroxide.

2. The method of treating a film having a photographic record of known type and an acoustic silver record mutually superposed which in a combined group of steps consists in treating the silver acoustic record with an ammoniacal solution of potassium ferricyanide, washing, then treating the film successively with a cupric chloride solution and an ammonium sulphocyanide solution, immersing the film in an alkaline solution to produce a cupric' hydroxide, and finally treating the film with a solution of sulphuric acid in order to convert the cuprie hydroxide into cupric sulphate.

3. The method of treating a film having a photographic record of known type and an acousl tic silver record mutually superposed, which in a combined group of steps consists in treating the .silver acoustic record with an ammoniacal solution of potassium ferricyanide, washing; then treating the film successively with a cupric chloride solution and an ammonium sulphocyanide solution, immersing the film in an alkaline solution to produce a cupric hydroxide in said film, and finally treating the film with a solution of hydrochloric acid inorder to convert the cupric hydroxide therein into cupric chloride..

PIERRE BU'IEZ,

PIERRE 'CONTANT. 

